EPM3256AQI208-10N - MAX 3000A CPLD, 256 Macrocells, 10ns | Altera
MPN： EPM3256AQI208-10N ✗ 停產EPM3256AQI208-10N 概覽
A CPLD (Complex Programmable Logic Device) is a non-volatile programmable logic device that combines multiple PAL-like Logic Array Blocks (LABs) on a single chip, connected via a programmable interconnect matrix. CPLDs occupy the architectural middle ground between simple SPLDs/PLDs and high-density FPGAs, providing deterministic timing, instant-on configuration from on-chip EEPROM, and high drive-strength outputs - ideal for glue logic, bus decoding, state-machine control, and I/O expansion. The MAX 3000A family from Altera (now Intel) was designed as a low-cost, high-performance EEPROM-based alternative to SRAM FPGAs in applications that demand predictable timing and instant-on behavior without external boot memory.
Key features of the EPM3256AQI208-10N include 256 macrocells (equivalent to 5,000 usable gates), 161 user I/Os, 10 ns pin-to-pin logic delay with internal counter frequencies up to 227.3 MHz in faster grades, in-system programmability (ISP) via the IEEE 1149.1 JTAG interface, hot-socketing support, and PCI-SIG-compliant I/O timing. The -10 speed grade offers the slowest timing in the family, making it suitable for cost-sensitive designs where the absolute fastest logic delay is not required.
Typical applications for this device include bus interface bridging, address decoding and latching in microcontroller/ASIC designs, glue logic for industrial control boards, peripheral I/O expansion, and legacy parallel-bus arbitration. The PQFP-208 package also allows hand-soldering or socket-based prototyping, which is useful for low-volume and educational designs.
When designing with this part, ensure the JTAG chain is correctly terminated with TCK, TMS, TDI, and TDO pull-ups per the IEEE 1149.1 specification, and verify that the Quartus II or MAX+PLUS II toolchain is used for design entry because the MAX 3000A family is no longer supported by modern Intel Quartus Prime releases. Designers should also confirm that the PCI-compliant I/O timing is only guaranteed at the -4 through -7 speed grades, not at the -10 grade used here.
直接替換替代品，適用於 EPM3256AQI208-10N — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： EPM3256AQI208-10N （相同外形與佔位） — 差異在於 Operating Temperature, Programming Interface, Package, RoHS Status, User I/Os.
EPM3256AQI208-10
✅ 直接替換聯絡詢價
查看資料表 →EPM3256AQC208-10N
✅ 直接替換聯絡詢價
查看資料表 →EPM3256AQC208-10
✅ 直接替換聯絡詢價
查看資料表 →EPM3256AQC208-7N
✅ 直接替換聯絡詢價
查看資料表 →EPM3256AQC208-7
✅ 直接替換聯絡詢價
查看資料表 →EPM3256AQI208-10N 最大額定值與電氣特性
| Family | MAX 3000A |
| Macrocells | 256 |
| User I/Os | 161 |
| Usable Gates | 5,000 |
| Logic Elements / LABs | 16 Logic Array Blocks (LABs) |
| Propagation Delay (tPD) | 10 ns |
| Counter Frequency | 118.7 MHz (max, -10 speed grade) |
| Speed Grade | -10 |
| Supply Voltage - Core | 3.3 V |
| I/O Logic Level Compatibility | 5.0 V, 3.3 V, 2.5 V (MultiVolt I/O) |
| 工作溫度 | -40 C to +85 C (industrial) |
| 封裝 | 208-pin PQFP (Plastic Quad Flat Pack) |
| 安裝類型 | Surface Mount |
| Programming Interface | JTAG (IEEE 1149.1) ISP |
| Process Technology | CMOS EEPROM |
| Hot-Socketing Support | Yes |
| RoHS 狀態 | Non-compliant (Pb-bearing PQFP package) |
EPM3256AQI208-10N 208-pin pqfp (plastic quad flat pack) 腳位配置指南
EPM3256AQI208-10N（208-pin pqfp (plastic quad flat pack) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： EPM3256AQI208-10N.
請參閱 資料表 以查看完整腳位配置。
典型應用
EPM3256AQI208-10N 適用於 6 應用s: Microcontroller Bus Address Decoding & Latching, Industrial Control Glue Logic & I/O Expansion, Legacy PCI Bridge & Interface Logic, Peripheral I/O Expansion in Networking Gear, Education & Prototyping Platforms, State-Machine & Protocol-Conversion Engines.
Microcontroller Bus Address Decoding & Latching
The EPM3256AQI208-10N is widely deployed as a high-density glue-logic device for decoding and latching multiplexed address buses in 8/16/32-bit microcontroller and ASIC designs. With 256 macrocells and 161 user I/Os, it can replace dozens of 74-series logic packages, freeing PCB real-estate and reducing BOM cost. The deterministic 10 ns pin-to-pin delay ensures clean chip-select and read/write strobe timing across the full industrial temperature range (-40 C to +85 C). Paired with an external JTAG programmer, the same CPLD can be re-used across multiple board revisions, lowering NRE costs for low-to-medium-volume industrial products.
推薦
Industrial Control Glue Logic & I/O Expansion
In factory-automation and PLC backplanes, the EPM3256AQI208-10N bridges legacy parallel buses (ISA, PC/104, VME) to modern microcontrollers via custom state machines. Its MultiVolt I/O interface supports 5.0 V, 3.3 V, and 2.5 V logic levels, allowing direct connection to both legacy TTL peripherals and modern CMOS ASICs without external level shifters. The on-chip EEPROM configuration boots in microseconds at power-on - critical for deterministic startup of safety interlocks and motor-control loops. The PQFP-208 industrial-temp package withstands the -40 C to +85 C operating range required by IEC 60068 environmental stress tests for industrial control equipment.
推薦
Legacy PCI Bridge & Interface Logic
The MAX 3000A family supports PCI Local Bus Specification Revision 2.2 timing in the -4, -5, -6, -7, and -10 speed grades, making the EPM3256AQI208-10N suitable as a glue-logic companion for legacy 32-bit PCI add-in cards. Although the -10 grade is the slowest, it still meets PCI 33 MHz 5 V signaling in non-critical decode paths. The 161 user I/Os comfortably accommodate full 32-bit address/data multiplexing plus side-band signals such as FRAME#, IRDY#, TRDY#, DEVSEL#, and PAR. Engineers migrating from older discrete-logic PCI designs benefit from the instant-on EEPROM boot, eliminating external configuration PROMs.
推薦
Peripheral I/O Expansion in Networking Gear
Routers, switches, and base-station line cards historically used the EPM3256AQI208-10N to expand a single Ethernet-management microcontroller into dozens of buffered GPIO, LED drivers, and watchdog timers. The 5 V-tolerant I/Os allow direct connection to legacy PHY LEDs and supervisory reset circuits, while the 3.3 V core reduces switching noise on the noisy RF/digital backplane. Hot-socketing support means the CPLD can be inserted into a live backplane without disturbing the running system - a feature valued in telecom and central-office equipment. The 5,000 usable gates also support FIFO flag generation and serial-to-parallel conversion for SPI-managed PHYs.
推薦
Education & Prototyping Platforms
University digital-logic labs and FPGA/CPLD teaching kits have long used the EPM3256AQI208-10N as a reference device because of its PQFP-208 through-hole-friendly footprint, JTAG ISP support, and abundant macrocells for student projects. Quartus II Web Edition (legacy free toolchain) and MAX+PLUS II both support the MAX 3000A family, allowing students to learn VHDL/Verilog design without commercial license fees. Although the part is obsolete, hundreds of university labs still have working development boards, making it a common training vehicle. The 10 ns propagation delay is sufficient for student projects involving UART controllers, simple CPUs, and VGA timing generation.
推薦
State-Machine & Protocol-Conversion Engines
The EPM3256AQI208-10N's 256 macrocells comfortably implement complex FSMs (finite state machines) such as I2C/SPI master-slave bridges, UART-to-parallel converters, and custom HDLC framers. Designers exploit the deterministic timing of CPLD logic (no DRAM-style uncertainty) to build hard-real-time protocol stacks that respond within 2-3 clock cycles of an edge event. The 161 user I/Os also let a single device serve as a fan-out buffer and protocol converter between multiple asynchronous buses in avionics and medical instrumentation sub-systems. Legacy medical imaging and instrumentation carts still ship with this CPLD as a board-level glue component.
推薦
推薦產品摘要
工程參考資料，適用於 EPM3256AQI208-10N — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | EPM3256AQI208-10 | EPM3256AQC208-10N | EPM3256AQC208-10 | EPM3256AQC208-7N | EPM3256AQC208-7 |
|---|---|---|---|---|---|---|
| Brand | Altera (Intel) | Altera (Intel) - same | Altera (Intel) - same | Altera (Intel) - same | Altera (Intel) - same | Altera (Intel) - same |
| Package | PQFP-208 | PQFP-208 - same | PQFP-208 - same | PQFP-208 - same | PQFP-208 - same | PQFP-208 - same |
| Macrocells | 256 | 256 | 256 | 256 | 256 | 256 |
| User I/Os | 161 | 161 | 161 | 161 | 161 | 161 |
| Speed Grade (tPD) | -10 (10 ns) | -10 (10 ns) | -10 (10 ns) | -10 (10 ns) | -7 (7.5 ns) | -7 (7.5 ns) |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) |
| Core Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| I/O Compatibility | 5.0 V / 3.3 V / 2.5 V (MultiVolt) | 5.0 V / 3.3 V / 2.5 V | 5.0 V / 3.3 V / 2.5 V | 5.0 V / 3.3 V / 2.5 V | 5.0 V / 3.3 V / 2.5 V | 5.0 V / 3.3 V / 2.5 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
主要差異化特點
- Industrial temperature range for harsh environments (對比EPM3256AQC208-10N)
- Largest CPLD in the MAX 3000A PQFP-208 family (對比EPM3128ATC100-10N)
- MultiVolt I/O supports 5 V/3.3 V/2.5 V without level shifters (對比EPM2210F256C5N)
設計說明
The EPM3256AQI208-10N requires a clean 3.3 V core supply with 1.5-2.0% regulation. Place a 100 uF tantalum + 10 uF ceramic + 0.1 uF ceramic decoupling network within 25 mm of each VCCINT pin pair. I/O banks (VCCIO) may be powered from 2.5 V, 3.3 V, or 5.0 V independently, but unused VCCIO pins must still be tied to a valid rail - floating VCCIO triggers I/O tri-state leakage and can cause hot-socketing failures.
Place the JTAG chain (TCK, TMS, TDI, TDO) on a dedicated layer with 4.7 kohm pull-ups on TCK, TMS, and TDI per IEEE 1149.1. Route JTAG signals away from high-frequency switching nets (>20 MHz) to avoid programming-time glitches. For multi-device JTAG chains, daisy-chain TDI->TDO and add a 10 kohm pull-up on the final TDO pin to suppress floating-state noise during ISP.
Do not use the EPM3256AQI208-10N in new RoHS-compliant designs - it contains lead-bearing PQFP-208 packaging and is not compliant with Directive 2011/65/EU. For new designs, migrate to MAX II EPM570F256 or MAX V 5M570ZF256, which offer higher density in lead-free packages. Also note that the -10 speed grade does NOT meet PCI 33 MHz timing at 66 MHz operation; verify PCI compliance requirements before using this grade in PCI add-in cards.
PQFP-208 packages exhibit ~5-8 nH lead inductance per pin, which limits usable I/O toggle rates to ~80 MHz at 50 pF load. For clock signals >50 MHz, route through the center LABs of the device and add 33 ohm series damping resistors to suppress ringing. Maintain at least 3W (3x line width) spacing between adjacent high-speed I/O traces to minimize crosstalk.
Estimated: at full I/O utilization (161 outputs, 50 pF each, 25 MHz toggle, 3.3 V swing), the EPM3256AQI208-10N dissipates approximately 1.6 W. The PQFP-208 has theta_JA of approximately 38 C/W in still air, giving a 60 C junction temperature rise above ambient. For sealed enclosures, derate output toggle frequency by 25% or attach a small aluminum heatsink to maintain junction temperature below 100 C.
合規資訊
PQFP-208 package contains lead; not RoHS compliant. Reach status declared compliant by Altera/Intel legacy documentation. Not AEC-Q100 qualified - not recommended for automotive applications.